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Use __builtin_popcountl if available to replace Ones() in GetImage.c

Alan Coopersmith requested to merge alanc/libx11:ones into master

If the compiler knows of a better algorithm for counting the number of bits set in a word for the target CPU, let it use that, instead of the classic algorithm optimized for PDP-6.

Based on libXext commit 490a25e6f8a4d2482af4364c700b68ad11a4d10b

Signed-off-by: Alan Coopersmith alan.coopersmith@oracle.com

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